Scilab Function
Last update : 15/1/2004

nansum - Sum of values ignoring NAN's

### Calling Sequence

  `s = nansum(x,orient)`

### Parameters

- `x`: numerical vector or matrix.
- `orient`: nothing or '*'. 'r' or 1. 'c' or 2.
- `s` : Numerical scalar or vector containig the value of the adding operation.

### Description

This function returns in s the sum of the values (ignoring the NAN's) of a numerical vector or matrix x.

For a vector or matrix x, s=nansum(x) (or s=nansum(x,'*')) returns in scalar s the sum of values of all entries (ignoring the NAN's) of a vector or matrix x.

s=nansum(x,'r')(or, equivalently, s=nansum(x,1)) returns in each entry of the row vector s of type 1xsize(x,'c') the sum of each column of x (ignoring the NANs).

s=nansum(x,'c')(or, equivalently, s=nansum(x,2)) returns in each entry of the column vector s of type size(x,'c')x1 the sum of each row of x (ignoring the NANs).

For the last two cases, if a row or column is in whole composed of NAN, the corresponding place of s will contain a NAN.

### Examples

        x=[0.2113249 %nan 0.6653811;0.7560439 0.3303271 0.6283918]
        m=nansum(x)
        m=nansum(x,1)
        m=nansum(x,2)

### See Also

`nancumsum`, `sum`,

### Author

Carlos Klimann

### Bibliography

Wonacott, T.H. and Wonacott, R.J.; Introductory Statistics, 5th edition, J.Wiley and Sons, 1990.